Abstract
Tunable two-fold magnetic anisotropy in two-dimensional arrays of Ni80Fe20 (permalloy) elliptical elements arranged along their long (LA) or short axis (SA) are demonstrated from the measurement of time-resolved magnetization dynamics. The anisotropy field is maximum (minimum) when the elements are closely packed along their LA (SA) and take an intermediate value when they are well separated. Micromagnetic simulations reveal that the centre mode of the ellipse shows the two-fold anisotropy and that the variation in the anisotropy field stems from the strong competition between the shape anisotropy of the constituent elements and the inter-element magnetostatic interaction fields within the arrays.
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